This is some thing i saw on the internet one day and more or less like this:
If you want to make it free just put $2
cause $2 is not real money so basically free.
If you want to price it cheap make it $7 cause $7 is $5 and anything below $5 is cheap.
If you want to make it premium make it $22 cause $22 is $20 and it's feel premium.
If some one want to pay $10 for game they are rich $10 or $20 the same for them.
more than that idk you must make AAA game i think.